Ed's point is that a sim is nice, but real pieces of silicon, carbon, and copper may not give you what the sim predicts. RM's circuit performance as a real, built item is outstandingly good. Makes me want to try to do better using vacuum tubes...

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"Pity, wrath, heroism, filled them, but the power of putting two and two together was annihilated."- EM Forster

Ed's point is that a sim is nice, but real pieces of silicon, carbon, and copper may not give you what the sim predicts. RM's circuit performance as a real, built item is outstandingly good. Makes me want to try to do better using vacuum tubes...

Might not!!!??? I have some simulated amplifiers that are so close to perfect it is scary. Of course when you build them they don't come close. Then after you tweak in all the real values they still don't!

Ed's point is that a sim is nice, but real pieces of silicon, carbon, and copper may not give you what the sim predicts. RM's circuit performance as a real, built item is outstandingly good. Makes me want to try to do better using vacuum tubes...

I fully realize that. So, even if it's twice as much distortion, we're still talking 0.0004%. OK, make it ten times as bad... 0.002%... big hoop dee doo.

I'm looking at peltier devices for cooling... hahaha.

You wanna do this with tubes?!?!? Your headphone amp is going to double as a space heater.

Dirk, I know that DBs work very well - already tried a simple unitary gain DB buffer (open-loop: there's more than one way to do it... ) with CCS on input bjt emitters and CFPs on output: it rocks.
Nevertheless, I'm afraid I can't get the point. I mean: you can build the DB you simmed, measure it, listen to it and then - if it works well and _as expected_) eventually submit it to Janneman's LA. Then someone will pop up and say: Damn, why another discrete DB? Wht not a 49600? Why not a simpler power follower with an active load...? There's more than one way to do it (yeah, I'm a PERL fan...), and probably my way is different from yours or Richard's - to me electronic design is a matter of good engineering practices * and * personal taste: as long as the former are obeyed...

Dirk, I know that DBs work very well - already tried a simple unitary gain DB buffer (open-loop: there's more than one way to do it... ) with CCS on input bjt emitters and CFPs on output: it rocks.
Nevertheless, I'm afraid I can't get the point. I mean: you can build the DB you simmed, measure it, listen to it and then - if it works well and _as expected_) eventually submit it to Janneman's LA. Then someone will pop up and say: Damn, why another discrete DB? Wht not a 49600? Why not a simpler power follower with an active load...? There's more than one way to do it (yeah, I'm a PERL fan...), and probably my way is different from yours or Richard's - to me electronic design is a matter of good engineering practices * and * personal taste: as long as the former are obeyed...

L.

Well, that's why I will never submit it to a magazine...

I was just playing around. Someone mentioned the idea of doing something great with a buffer with as few transistors as possible. So, thus the gauntlet was thrown down.... at least I had the guts to rise to the challenge. What's your circuit that meets those requirements? Can you show one? Come on, I'm waiting... Do you have a SE mosfet circuit lying around that sims good? Ha, I bet Mr. Pass can come up with something fantastic with ONE transistor... HAHAHA. Me, I'm not that talented.